Telegraph system



Aug, 28, 1923. 1,466,234

M. B. KERR TELEGRAPH SYSTEM Filed Feb. 1, 1922 2 Sheets-Sheet 1 Mar/f 5. Kerr Aug. 28, 1923.

M. s. KERR TELEGRAPH SYSTEM Filed Feb. 1, 1922 2 Sheets-Sheet 2 Mark 5. Kerr Ill Patented Aug. 28, 1923.

UNITED STATES PATENT OFFICE.

MARK B. KERR, OF ROSEBANK. NEW YORK, ASSIGNOR TO WESTERN ELECTRIC COM- PANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

TELEGRAPH SYSTEM.

Application filed February 1, 1922.

To all whom it may concern.

Be it known that I, Mann B. Kenn, a citizen of the United States, residing at Rosebank, Staten Island, in the county of Richmond, State of New York, have invented certain new and useful Improvements in 'lelegraph Systems, of which the following is a full, clear, concise, and exact description.

This invention relates to telegraph systerns.

An object of the invention is to provide a system whereby a plurality of telegraph messages originating at separate stations may be transmitted over a plurality of branch lines or extension circuits to main or central stations where synchronous multiplex apparatus is located for automatically and simultaneously transferring the code combinations of signaling impulses to a line connecting the central stations.

Another object is the provision of means associated with the synchronous multiplex apparatus for providing a complete overlap between the selections received from the extension circuits or branch lines and those transmitted by the synchronous multiplex apparatus to the line connecting the central stations.

The invention provides synchronous multiplex and start-stop apparatus at the central stations with means associated therewith, such as a series of condensers and a plurality of groups of relays for providing a complete overlap between the selections so that irrespective of what the phase relation bctween the start-stop and the synchronous multiplex apparatus the selections coming in on the startstop will be directly transmitted to the multiplex apparatus providing that the speed 01: the start-stop is exactly equal or slightly less than the multiplex apparatus.

The invention is illustrated in the accompanying drawings which represent one embodiment of the invention, and when arranged so that Fig. 1 is to the left of Fig. 2, a complete system is shown diagrammatically.

The invention, in general, comprises a branch otiice A, which is connected with a main or central otlice B by an extension circuit or branch line 6. A central or main station C connected with the main station Bby a line conductor 7 equipped with duplex Serial No. 533,179.

apparatus and a distant branch oiiice D, which. like the branch otiice A, is connected with the associated central station C by an extension circuit 8.

At the branch otiiee A there are located transmitting and receiving equipments E and 1*, respectively, being shown diagrammatically. The extension circuit 6 maybe a pair oi line conductors or a single line conductor equipped with duplex apparatus, as illustrated in the drawings. Both of the central stations I3 and C are provided with receiving distributors G and H of the startstop type, serving to receive the code combinations oi message impulses from the respeci'ive substations or branch offices and transferring them to the multiplex synchronous distributors I and L, also located at the offices l3 and C. respectively, through the instrumentalities of a plurality of condensers in combination with a plurality of groups of relays. Also located at these central offices are multiplex synchronous distributors K and M, each of which serves to receive the signaling impulses from the lineconductor 7 connecting these two stations and transfer ring the same to the startstop distributors N and ll, respectively. Branch oiiice D, like brunch otlice A. is provided with a transmitting distributor P and a receiving distributor Q. which serve their respective purposes. For the sake of simplifying the drawing, the apparatus common to one channel has been shown in detail, while that individual to the other channel has been shown schematically.

The transmitting equipment E comprises an intermittently operable rotary distributor 10. having a brush arm 11 which carries a pair of brushes 12 and 13 which, in turn, are arranged to make contact with rings 14, 15, i6. and 17. The outer ring 17 is divided into a plurality of segments 18, 19, 20, 21, 22, an d 23, which are connected with the respective contacts of a transmitter shown diagrammatically at 24. In order that the brush arm 11 will be stopped and released once per revolution, a release magnet 27 is provided which is under the control of a start relay 28. which is controlled by a. comupon contact on the transmitter 24.

The transmitter 2st consists of a plurality oi movable contacts 30, 31, 32, 33, and 34, which are connected to the respective segments forming the outer ring 17 of the distributor 10. Also in the transmitter 24.- isa common Contact 35, which, as previously stated, controls the energization of the start relay 28. Although the transmitter Q l has been shown diagrammatically as a keyboard transmitter, any well-known type of tran mitter may be substituted therefor, which will provide equally good results.

At the central oflice B there shown a receiving distributor G of the start-stop type and a synchronously operated dis;- tributor'I, which has its continuous rin c0nnecte'dto"the apex of the ratio arms, which include the receiving relay 99, forming a part of the duplex equipment connectedfwith the line conductor 7. The line relay"99 responds only to incoming ilii pulses and is non-responsive to outgoing impulses, Upon the operation or" the multipl'ex'distributor I, this relay will not spond to impulses which may be transferred thereto from the start-stop (list'ributor The'startstop distributor (l comprises an outer ri'ng Q4 and an inner 'f I Forming a part oi the outer ring is a pluralitv oi segmentsefi, 48, 49, 50, 51, and 52, each of which corresponds to respective ones ot the segments on the transinittiiu distributor 10. By the proper orientation oi these senments and inasmuch as they are smaller than the transmitting SOQIHQTIL'S of the transmitting: distributor 10, the central portion of the signal impulses transmitti over the extension circuit (5 to the line relay :1?

will be picked up from each segment o l the sending face at the branch ol'licc A. 'l he distributor G also comprises a brush arm ll carrying a brush 4L2 which is held against rottrtionliy a release latch 4 3 under the control of release magnet 39.

interposed between the start-stop tributor G- and the multiple): or Syl1Cl1I' nously operated distributorl is a set oi coin densers in combination with a pair oi groups of storing" relays operable in accordance with the signals transmitted and controlled by a series of transfer relays under the control of both the starbstop (listributor G and the multiplex distributor The set of condensers and the two groups of relays, serve to provide a complete ()VCIlH 'l between. the selectionsreceived from the start stop distributor (i and those trans mitted out over the line '7 by the multiple distributor I, irrespective of what the phase relation. is between the brush arm oi. the start stop distributor G and the brush arm of the multiplex distributor I, proriilinnx of course, that the speed of the brush arm of the start-stop distributor is exactly equal orslightly less than the speed oi the brush arm of the RHlliLi QlQX distributor l. Th2 condensers 56, 57, 58, 59, and 60 e counected directly to the receiving segments of the distributor forming the outer ring eh (11*, and will he charged in accordance with the operation of relay 38. The first set oi? storing relays,coniprises relays T0, Tl, 7Q,

and 74:, which are und r the control oi the condom 56 to 60, inclusive, the energzizing circu ts of which are completed through the ilii'lDtLilUl'QS oil? transfer relay (ll which, in more ch y descrilied herein after, is cmitrolled through the segrmcn s 4 3 and oi? the distriinuior The second set 0! storing}; relays comprise the relays 7G. 77, 7F 79, and 80, which are under the control of the first set oi relays and are also lOOliC-(l up upon their energination. Thus, after :1 set of impulses l as been transmitted 'troni the distributor l? to the condensers 56 to (Tl), the transfer relay 5! energized :lor establishin it discharge cireuit :lor said (501M. 1 the lefthand windings oi. the first set oi Ulillfl relays 70 to wl'iich will be cuer 'i dos pending upon which ones of the coinuguscrs are cl These relays will also he the iinlhilses st red in the condensers ha e locker? up through been cleared out the next succ i of message impulses may lit at up on the 56 to (30, inclusive. filter the i storing relays 70 to Tl are enerixed, they estal'ilish. through their contacts, energizing circuits for the c i rrcs ion liug ones of the storing relays of the sconil set. which, like the first set, are locl al up and maintained in such position lllle-li. released by relay under the control oi the multiplex (listrilnitor I. it is through the coutacts oi the second set oi storing role s that the polaritj of the iir'uil corresponding' to the various ors u; varied.

order that the impulses 'ill ht: trans icrred iironi the respe min parts of the cuit so that no emulation of si; ls result, such transfer 's rudcr the oiut Control of the start-stop distributor i and the Synchronous iiuilti 'il ilistrihutor f as wiil honioi'e clrurly ll'iSC/i'll cll l1c nu';"t-, r

[the apparatus ust described cons the eiyuipniont locate-1! at the central stziti n l), which serves to truusi pulses roin the branch oli'ico A to the line wiuluctor T and thence to the we? ral olliiw C from which the iuossr 1 impulses ar transmitted to the distant hranch oliii-o l).

The apparatus 1 the central ollicu i which, receives the signals transmitted li 'llll the tra remitting apparutus located. at the centre? ollice l3 comprises :i multiplex 'lriliutor hi and a ilistriluitor ii? the startstop type ll. The multiple: (Eislriluuior M coinprh among other parts a cmitinuous condensers sot ot' into a plurality of segments 107, 108, 109, 111 and 112. Like the distributor 1 a continuously revolving brush arm 102 carrying brushes 103 and 10st is also provided. Con nectcd to the smaller segments forming a part of the outer ring are the windings of a set of storing relays 115, 118, 121, 121 and 127 which serve in combination with the other two sets of storing relays llet, 117, 121, 122, 12c and 116, 119, 122, 12s and 12s to provide a complete overlap between the selections transmitted from the multiples; distributor M and those transmitted over the extension circuit 8 by the start-stop distributor it.

The start-stop distributor li comprises an outer ring divided into a plurality of smaller segments 1.32, 33, 13 1, 135, 136 and 137. The first tiyc oi these segments are connected to the right-hand armatures of the storing relays 115, 118, 121, 121 and 127 which, upon their energization, are locked whereby the armatures thereof remain in the position set until due to a subsequent selection they are released for transmitting an ctlect opposite to that when they were energized. For bridging the outer ring of the tlis'll'llilb tor R, with the inner ring 1358 the distributor has a brush 180 carried by a brush arm 129 which is normally held against rotation by a latch under the control of a release magnet 131. The release magnet 12-31 is controlled through contacts on the relays 111,

17, 120, 123 and 126 so that upon the energization of any one of these relays an energizing circuit for release magnet 131 is established for causing the release of the brush arm 129.

The receiving equipment Q at the branch oflice D comprises a receiving printer diagrammatically shown at 155 which conr prises the usual selecting magnets 1:36, 157, 158, 159 and 160 and the printing magnet 168. The respective magnets have their windings connected to the segments 1G1, 162, 16 3, 16-1 and 16?) forming a part of the outer ring of the receiving distributor 14%. The distributor 144 like the distributor (i has a brush arm 1-1-7 carrying a brush 11-8 which is arranged to bridge the segments forming a part of the outer ring with the segments 15 1-, 166 and 152 {or controlling the energi alion oi the respective ones of the selectin magnets depending upon the energization or relay 151 which, in turn is controlled by the line relay 1.4-6 connected to the extension circuit S.

inasmuch as the apparatus associated with the other channel of the system is identical with the equipment just described, turthcr description thereof is considered unnecessary here. However, the rectangles designated by the characters S and T represent the equipment intermediate the distributors i and I, and M and B respectively, which,

as previously described, are shown diagram mat' ally tor the salce ot' clarifying the drawings. 7

The operation of the equipment just described is as follows: iissume tor the salze ot' clearness that the branch oltice )1 desires to communicate with the branch ollicc D in which case the transmitter 2-1 will be operated to set up a particular combination depending upon the message desired to be transmitted. Let it also be assumed that it is desired to transmit a character in which the contacts 39, and 31 ot the transmitter Q-lare actuated to close their respective contacts. As previously tlGSCllllGll, upon the operation of the transmitter 2-1 contact 235 will be closed for causing the energization of start relay 28, the energizing Cll'ClIlt Oii which extends from battery, through the left-hand winding thercol, contact 35, segment 15, brush 13 and segment 141 of the transmitting distributor 10 to ground. The start relay 28 is thereupon energized and is locked up over a circuit under the control of brush 13. Upon the energization of the start relay 28, an energizing circuit is es tablished for the release magnet 27 which in operating withdraws the release latch unc er its control from engagement with the brush arm 11 which is thereupon tree to rotate whereupon the brush 1.2 consecutively completes circuits extending from the segments 18, 19, 20, 21. and and the contacts oi the transmitter 241- which have been operated through the winding oi' the pole changing relay 29. The pole changing relay 29 is energized upon the passage 01 the brush 12 over a segment to which one of the closed contacts of the transmitter 2.1. is connected for applying to the line 6 an impulse of a polarity corresponding to that normally applied therclo. l'lowever. the instant the brush 12 passes of? of segment 23, an open circuit condition is established whereby the pole changing rclay 29 reverses the position of its armature and connects the positive source of current with the apex of the ratio arms in which the receiving relay 3G in corn nected, but which does not respond to out-- going impulses. The receiving relay 3? located at the central otiicc 13 docs however, respond to such change in polarity and reverses the position of it armature whereby the energizing circuit of the relay 38 is broken, consequently, an energizing circuit for the release magnet 39 of the distributor G is established. The release magnet 39 being energized, the brush arm 41 is thereby released for rotation owing to the withdrawal of the release latch 1-3. lontact 30 oi the transmitter 21- being closed an energizing circuit For the pole changing relay is established upon the passage of the brush 12 over the segment 18 of the transmitting distributor 10, thus connecting the ring the impulses stored.

Wiih

the me er 'iduet reversal oi the relay 3? to the L i which in L Lhe relay 3S. emuiue e! emu The emitzieii $1 i,

open, tie peh reverse he the passage meet 39 tn being; mi USN i mu (if it:-

i-H? re le pewimz:

r euueeza the i119; rein L r, 0?? it; urnuiiure umi iieeeerg tieu e? i "pawn": of ii. the i iiet l he ehnr ed er ezu'ieiugg lureed in new gismtiou eii reiav 38 upon the hrueh 47-53 ever 1 segments: eendcmeers are eem'ieeteih' will however, net he Lti12il' l((i tact 13 0'! the trzmsmifler that an open circuit eemhtiun ahiished upon the passage The hrush over (he Segment indw'ifiuuiiy therein, duet prior he 1} v e (ii reizzrtien of to the (:ompief r Oi mzere'ix' H rireu. eetuhiishr my exteiuiin e; FY0211 heifer i'hreuggh tile hand whirling (if h s rein nieu'i', brush and the segment i 'i' uiui. iny (33 is thereupon wer or; mui ieekeri up ever :1 eireuiii exitemimg 'iiilifiilfl'h the ie'iit-hzuui, .puzrii tact thereof, rig'i Phemi uimii hului armature :mri uermzri (-en (34; to gg'roumi Rein (S 3 in eies' hzmfl Contact est: hiiehes an en euii' for rein}, 62 hie/h is: oi"

reieme type. from the ie'it-imiui are :Uure content of rehry (35 Winding right-hand zrrhmiiure and :11 e eeuhu-t 0i rein v 3 {uni the normal (mum-e ziuxi irii; hzuui m'nuriiure of relay K3 '0 gmumi. iuy in (singing; 'ii's iei 'hhtuui ziiieruzziie emitear eetnhiishee en ener eirwi i 1213; (i i whereupon the imhiiu A relay (52, an energizi' for the t ansfer rein; 6i Whirl: controls a. plurality of m'maturee ix) whieh the emr de'nsers 5G to 30 are eeuiieei'ei! r iriu Y en the condensers "T TO. :uui herevieusly nie- Hi u. we

1 Fa) the first set 7 sh. in W! rim: 0 7 the estuir irisi'unelit 0'5 e circuit for hese emeienseri; HTOF- ii i .e of the (20:1- iae'rs under the i ifihe truneiifer rein G1. Reiuye 701 L wei'eeii iheir right-iruui (rmii'ziei's h z: ieeicu (:ii'- 7 euit ihere'ibr free; through ihe ri;

1e eeruieusers i u'uiirgr mi 1 the ener- .e:u;e rehlfw ($2 muses the h mmii'i'ione i ie'i er relay ill he control it me); die- A iriiiuiier .7 m N A (H rhe brush 88 over segnunr 97 oi the muiti'giex (he 90 a1 energizing circuit is estab- 1 rehu; miii'i huier I d ed iii-r A e iron: iizrtiiery.

ring; brueh 88, segn'ieni; J7, winding; of

relay I end fire 1 ghhhzmd zu'mz'iture and r (x-t1. estahhshes Relay in ei'ier 'iziiui :u" its right- 1 hand eentaeii m energim 4 eui-u i. For relays 75. 7S and SO eerr-r sueiuii The reiuys l A 70 71.. and 7+} or the hreii 0 sinruu: re-

"e! (use to the 5H ililii (30.

(iieei urge 01 the eornieu The iiliilifli energizing ijheee have extends '01'1'1 hm ihe Windiheree'f. ieiii-hzu'iz'i rem Iure iui contact 1e Storing ]0il '\'S Rh i2 2 and 74- (if the (YE 2L}? 11ml SW upon 65 to grcuuui. Relays 76, closing their iewer cum-Mei iili'iiiF-QlQS locking" CiJCliit- 'li'iereii'er exieauhug: from hat fiery through The winding of eueu of these relayia lower eeilim'ii mini :11: mliure thereof and (he uorn'mi cent r? 1113i e uuiture e eirur iut rehry Si 0 grreumi. .iiehryw; 76, TR an 80 ti'iereupen remzlm energized HDi'li Pier the metro! oi The multipier; distributor 1e Reizry ($5 in etrrueiiiire' 'ts ief1-hzu1d :rrmzriure iiet, reurm'ee (he hutte y ezrzueei'ien he t e slow in reie: se ump re?" (3"), thereby pre- .iie rei: shm'liri,

the energimtien (ii in the meantime, the relay he energized due to the bridging of the segments 52 and 46 of the distributor G by the brush 42, and secondly, establishes an energizing circuit for relay 66, which. as preriously described, controls the locking in i of the lirst se of storingrelays '70 to. Tl so that any ot these relays which happen to be energized at this time will be released for receiving the next succeeding sci oi impulses which may have previously been stored on the condensers 56 to 6 and, of course. subsequent to the transfer of the previous charge tothe relays forming the first set of storing relays.

Upon the passage oi the brush S9 of the multiplex distributor I over the respective ones of: the segments to which these relays are connected, a polarity of battery depending upon the cnergization oi the storing relays T6 to 80 will be applied to the apex of the ratio arms to which receiving relay 99 is connected and thence over the line con ductor T to the central station (1. Upon the passage of the brush 89 over segment 91 to which the armature of storing relay T6 is connected, an impulse of positive polarity will be transmitted to the central station C which passes through the windings of the receiving relay 101 {or causing, the reversal of its armature. The negative pole of the battery associated with the contacts of this relay is thereupon connected with ring 113 of the distributor M so that upon the passage of the brush 104: over the segment to which the storing relay 115 is connected this relay will be energized over a circuit extending from battery, upper contact and armature of receiving relay 101. ring 113, brush 104, segment 10?. right-hand armature and normal contact of relay 111. winding of re lay 115 to ground. Relay 115 in closing its left-hand contact establishes an energizing circuit for itself extending from battery through the left-hand armature and contact of relay 116. winding of relay 11 1, left-hand armature and contact and the winding of relay 115 to ground. Relay 1111 being energized upon the establishment of the circuit just traced, opens upon the attraction of its armature the initial energizing circuit of re lay 115 and closes at its right-hand alternate contact an energizing circuit for relay 116 which, as will be more clearly described hereinafter, is notenergized until the reception of a subsequent selection oi a polarity oppposite to the previous selection which caused the energization of relay 115. It is thus seen that the relay 115 will remain in the position set until the reception of a subsequent selecting unit differing in polarity from the one which previously caused the energization of this relay. As the brush arm 87 continues to rotate. conditions depending upon the position of the armatures of the storing relay 76 to 80 inclusive, willbe set up for causing the corresponding po sitioning of the armature of receiving relay 101 at the central office C. Thus upon the passage 01 the brush 10% over the segments to which the storing relays 118, 121, 12 1 and 127 are normally connected, these relays will be energized depending upon the energization of the storing relays ofthe second set located at the central o'ltice B. For the particular selection chosen, storing relays 121 and 127 will be energized over circuits similar to that traced in connection with storing relay 115. The energizediones of these storing relays will also be locked up through contacts in a manner similar to that described in connection with the storing relay 115. Upon the passage of the brush 10 1 over the segment to which the storing relays 118 and 121: are connected these relays will not be energized owing to the position of the armature of relay 101. However, had these relays been previously energized, an energizingcircuit would be established for the relays 119 and 125 of the second set of storing relays, the circuit of which extends from battery, winding of these relays, righthand alternate contact and armature of relay 117, segmentv 10S, brush 101, ring 113, armature and lower contact of relay 101 to ground.

Following the passage of the brush 89 over segment 90 of the multiplex distributor I, the brush 88 engages segment 96, whereupon an energizing circuit is established for relay 81 which extends from battery through ring 98. brush 88. segment 96 and the winding of relay 81 to ground. Upon the energization of cut-out relay 81 the locking circuit for the relays '76, 78 and 80 is broken thereby restoring these relays to the position shown in the drawings.

Should the brush 88 01'' the multiplex distributor I pass over segment 97 prior to the passage oi the brush 12 over segments 16 and 52 01'' the distributor G. the energization of relay 62 will be prevented due to the energization of relay in the manner previously described. Thus. upon the continued rotation of the brush arm 87 no mutilation or piling up of the signals will be caused owing to the energization of relay 65 and nothing will occur except the transmission of a blank signal over the line conductor 7, which will have no effect on the printing mechanism at the branch oflice D.

Following the passage of the brush 104 of the multiplex distributor M over segment 112. brush 103 bridges segment 105 with ring 106. whereupon an energizing circuit is established for the release magnet 131 of the start-stop distributor B. This circuit extends from battery through the winding of the release magnet 181, conductor 139, segment 105. brush 103 and ring 106 to ground. Release magnet 131 upon being energized withdraws its release latch from engagement with the brush arm 129 thereby permitting the rotationthereot. The brush 130 carried by the brush arm 12f) consecutively connects the segments 1,32, 133, 134i, 135 and 136, which are connected with respective armatures of the storing relays 115 118. 121, 124and'12 7 in circuit with the Winding of the pole changing; relay 14:2 Prior to the engagement of the brush 1230 with the segment 1.32 and upon thepassage of this brush off of segment 13. pole changing relay-142 is deenergized thereby impressin; on the-'eXtension circuit 8 an. im 'uilse ol :1 positive polarity which, upon being received at the branch o'llicc 9 causes the reversal of the armature of the receiving: relay H6. Relay H6 in re ersing the position Ofl itS armature causes the lceuergization oi? relay 1.51. which in turni closes through its back contact an energizing circuit for the release n'iagrnet 150 oi the distrilmtor 1H, thus releasing the brush arm 14? forrotationl Upon the passage oi the brush 180 over segment-132 andewing: to the fact that the stori'ngrelay 11.5 energized an energiz-- ing circuit is established for the poic change inn relay 1 12 eXt-endin g: from battery to the ring 1.38, brush 130, segment 132 of the distributOnR. right-hand armature and contact of storing relay 115 and the winding: of the pole changing relay 142 to ground. The closure of such-a circuit causes the energization ofthe pole changing relay 1 162, which impresses on the extension circuit 8 an im pulse of a negative polarity for causing the reversal ofth'e position of the armature of the receiving relay 146 to the position shown in thedrawing; consequently causing the en ergization oii relay Relay 151ibeing nowenergized upon the passage of the brush 148 over segment 161, selecting magnet 156 connected to this segment will: he energized over a circuit extending: from battery through the \vind'ingr'of this magnet, segment 161, brush 148; ring-15st and the alternate contact and armature ofrelay 151 to ground. The movement oit'the selecting bar under the control ofthis. magnet will he efiected at this time.

The brush 130 in passing over se 'ment 133 and inasmuch as storing relay 11S 13 not energize/(l causes the pole changing relay 142 to reverse the position of: its armature and impresses on the extension circuit 8 an impulse of as positive polarity; Similarly, upon the passageof the brush 1&8 over segment-162m which the selecting magnet 157 is connected an open circuit condition is es tablished owing to the fact that the receivingrelay; ltfi has reversedthe position of its armature and, in. turn, caused the deenergization of relay 151.1 Conditions similar to those just described for selecting magnet 156 will be established upon the passage of thebrush-HS over segments 163 and 165 branch ofiice A will be rewarded on the receiving printer 155 at the branch ofiice D over one channel of the line coni'lnctor 7 equipped for duplexoperation.

.iiilthounh the invention has been illustrated in connection with a vstein Wherein code combinationsv oi no impulses originating at a branch otiice are transferred to a main or central oiiice at which synchronous print ng telegraph apparatus located and thence over a conductor equipped for duplex operation, to a second central or main station having equipment sin'iilar to that just referred to from \vhch it is trans- 'i'ferrcd ov an extension circuit to a distant ()lliCBg it o'tconrse, obvious that the invention may be readily applied to other types of systems Without departing from the spirit and scope of t-heipresent invention.

What is claimed is: V

Lina signaling system, receiving and transmitting distributor mechanisms, signal storing means intern'iediate said mechanisms for providing a complete overlap between the selection received by the receiving dis tribntor mechanism and those transmitted by the transmitting distributor mechanism comprising electrostatic means and a plurality of sets of storing relays, and means controlled by thereceiving distributor mechanism :ifor transferring the effects of said electrostatic means to said relays.

2.111 a signaling system, receiving and transmitting distributor mechanisms, signal storing means intermediate said mechanisms for providing a complete overlap between the selection received by the receiving distributor mechanism and those transmitted by. the transmitting n'iechanism comprising electrostatic means and'a plurality of sets otstoring relays, and means controlled by the transn'iitting distributor mechanism for preventing the transfer of the effects of said electrostatic means until after a predetermined time. i

3. In a telegraph system, a plurality of stations interconnectedby a line conductor, duplex equipment located at each of said stations; synchronous multiplex apparatus associated'with said duplex equipment, an

rant, w oi printing magnet s ament' 1G7. brush 143 and segment it-S5 to round. Thus the signals transmitted tr m the ratus and those transmitted by the syn chronous multiplex apparatus.

4.111 combination a line conductor equipped for duplex operation connecting two main stations, SyDClilOIlOllS multiplex apparatus located at said main stations and connected to said line conductor, an extension circuit extending from branch ollice to said main otlice, intermittently operable distributors located at said main station and connected to said extension circuit, and storing nieansintermediate said multiplex ap paratus and said intermittently operable distributors comprising a series of condensers corresponding in number to the number of code units employed and a plurality of sets oil storing relays for providing a complete overlap between the selections received by the intermittently operable distributor and those transmitted by the synchronous multiplex apparatus, and means controlled by the intermittently operable distributor for trans fer-ring the effects of current impulses stored on said condensers due to theoperation of said distributor to said storing relays.

ln combination a line conductor equipped for duplex operation extending between two central stations, synchronous n1ultiplex apparatus associated with said line and located at said central stations, an extension circuit, a start-stop distributorlocated atsaid central stat ons and connected to said extension circuit, and storing means interme diate said multiplex a )paratusand said startstop distributor COIl'll'H'iSlnQ a series of electrostatic devices and a pair of sets of storing relays iior prtwiding a complete overlap between the selections received by the start stop distributor and those transmitted by the synchronous multiplex apparatus, means controlled by said start-stop distributor for transferring the ef'lects of impulses stored in said condensers to one set of said storing relays, and means operated subsequent to the tminsterrino ot' the el'l'ects from said condcnsers to said storing relays for causing the cnergization of the second set of storing relays depending upon the energized ones of the first set of storing relays.

In witness whereof, I hereunto subscribe my name this 30th day of January A. D.,

MARK B. KERR. 

